Back wrap having thermal cells



FIG. 1 is a top view of a back wrap having thermal cells, embodying our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof; and

FIG. 4 is a left side elevational view thereof; the right side elevational view thereof being a mirror image; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a back wrap having thermal cells, as shown and described. 